Manitoba Releases Latest Crop Pest Update

Insects: Foliar insecticide applications for flea beetles are occurring, but the overall amount of applications seems less than in recent years.

In some areas some fields of canola are already into the 3-4 leaf stage or beyond, and less susceptible to flea beetles.

Some cutworm control is also happening, but not to the extent
of a couple of years ago.

Dingy cutworm appears to be a common species in some of the areas
experiencing high level, and some redbacked cutworms have been found. There was some army cutworm around earlier in the spring.

This cutworm species overwinters as partially grown larvae, pupates relatively early, and many would now be adults and migrating west for the summer.

Aster leafhopper samples have been collected from the Northwest, Southwest and Central regions and submitted to test for percent infectivity with aster yellows.

There is no data on this to report yet.

Diamondback moth counts have increased substantially over the past week in the Eastern and Central regions.

Diseases: Resist the temptation to jump to conclusions about the cause of yellowing in your cereal crops; a disease like barley yellow dwarf is currently a very remote possibility.

Watch for the first Fusarium Risk Forecast maps to be posted the week of June 19th.

Winter wheat may be approaching the vulnerable growth stage, however the hotter weather we have been experiencing –
temperatures above 30C – would lower the risk of infection.

Weeds: Another week of challenging spray conditions has meant a lot of early morning and late evening spraying across the province.

High temps during most of last week meant chasing cooler temps early and late in the day to hopefully reduce crop damage while still getting effective weed control.

High temps have seen explosive growth of C4 (warm season) weeds like kochia, green and yellow foxtail, and red root pigweed.

(Government of Manitoba News Release)

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